The property of the sides of a triangle. Reflection.

Drawing the central perpendicular and the perpendicular line of a segment.

 

1. The sum of every two sides of a triangle is .................... than the third side. Can the sides be:

                                                       4 cm, 12 cm and 6 cm
                                                        13 m, 15 m  and 20 cm
                                                       135 km, 200 km and 180 km?

 

2. One side of a triangle is 21 cm and the second one is by ¹/7th longer. Find the third side of the triangle if the perimeter is 65 cm

 

 

 

3. A triangle has two equal sides 13,5 cm, the perimeter of the triangle is 56,4 cm. Find the third side.

 

 

 

4. The first side of a triangle is 12 cm, the second one is 80% of it and the third side is 4,6 cm shorter than the sum of the first two sides. Find the perimeter of the triangle.